package cn.jinjimi.base.util;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.text.style.ImageSpan;

/**
 * Created by Roy
 * 让ImageSpan居中显示~~
 * Date: 2017/4/10
 */

public class VerticleImageSpan extends ImageSpan {

    public VerticleImageSpan(Context context, int resourceId) {
        super(context, resourceId);
    }

    public VerticleImageSpan(Drawable drawable) {
        super(drawable, ALIGN_BOTTOM);
    }

    public VerticleImageSpan(Context context, Bitmap bitmap) {
        super(context, bitmap, ALIGN_BOTTOM);
    }

    @Override
    public int getSize(Paint paint, CharSequence text, int start, int end,
                       Paint.FontMetricsInt fm) {
        Drawable d = getDrawable();
        Rect rect = d.getBounds();
        if (fm != null) {
            Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
            int fontHeight = fmPaint.bottom - fmPaint.top;
            int drHeight = rect.bottom - rect.top;

            int top = drHeight / 2 - fontHeight / 4;
            int bottom = drHeight / 2 + fontHeight / 4;

            fm.ascent = -bottom;
            fm.top = -bottom;
            fm.bottom = top;
            fm.descent = top;
        }
        return rect.right;
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end,
                     float x, int top, int y, int bottom, Paint paint) {
        try {
            Drawable b = getDrawable();
            canvas.save();
            int transY = 0;
            transY = ((bottom - top) - b.getBounds().bottom) / 2 + top;
            canvas.translate(x, transY);
            b.draw(canvas);
            canvas.restore();
        } catch (Exception e){
            e.printStackTrace();
        }
    }
}
